<template>
  <div class="login-container">
    <div class="login-box">
        <!-- 头像 -->
        <div class="avatar-box">
            <img src="../assets/logo.png" alt="">
        </div>
        <!-- 登录表单区 -->
        <el-form :model="loginForm" :rules="loginFormRules" ref="loginFormRef" label-width="0px" class="login-form">
            <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" show-password></el-input>
            </el-form-item>
            <!-- 按钮 -->
            <el-form-item class="btn">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 5, max: 8, message: '长度在 5 到 8 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置表单数据
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 登录前进行预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        // const result = await this.$http.post('login', this.loginForm)

        // 将响应对象中的data属性解构出来
        const { data: result } = await this.$http.post('login', this.loginForm)
        console.log(result)

        if (result.meta.status !== 200) {
          return this.$message.error('用户名或密码错误！')
        }
        this.$message.success('登录成功！')
        // 登录成功后，将token保存到客户端的sessionStorage中, 其他页面只有登录后才能访问
        window.sessionStorage.setItem('token', result.data.token)
        // 通过编程式导航跳转到后台主页, 路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login-container{
    background-color: #2b4b6b;
    height: 100%;
}
.login-box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 10px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    .avatar-box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        margin: -65px auto;
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login-form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btn {
    display: flex;
    justify-content: flex-end;
}
</style>
